Finding the Fourth Proportional to 142,978.69, 214,469.48 and 43,139.71

Step by Step Solution

1. Step 1: Write the proportion equation
   142,978.69 : 214,469.48 = 43,139.71 : x
2. Step 2: Convert to fraction form
   142,978.69/214,469.48 = 43,139.71/x
3. Step 3: Cross multiply
   142,978.69x = 214,469.48 × 43,139.71
4. Step 4: Simplify right side
   142,978.69x = 9,252,151,171.05
5. Step 5: Solve for x
   x = 9,252,151,171.05/142,978.69
6. Step 6: Final answer
   x = 64,710.00